That helps somewhat, but I'm still abit confused. So am I trying to find what t, u, and v are?
As hint we were told to try and evaluate a linear combination at -1, 0, and 1. How would I do this?
Well, the equation exhibited in post # 2 has to hold for all values of x. If you plug in those three values, one at a time, you get three fairly simple equations for the three unknowns. Then you can solve for them. And, assuming you get even one solution, you will have proven what you need to prove.